Figure Output blank but no errors

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S 2024-2-3

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https://ww2.mathworks.cn/matlabcentral/answers/2077936-figure-output-blank-but-no-errors

评论： Aquatris 2024-2-5

I am trying to plot the frequency response of all of the outputs as shown below, for some reason figure 2 is just blank. I have no errors so I am unsure what is wrong. Thanks for your time!

close all

fs = 20e3;

numFilts = 32;

filter_number = 5;

CenterFreqs = logspace(log10(50), log10(8000), numFilts);

t = linspace(0,2*pi,200);

input = sin(t) + 0.25*rand(size(t));

figure

hold on

for ii = 1:filter_number

output = gammatone(input, CenterFreqs(ii), fs);

plot(output)

end

Unrecognized function or variable 'gammatone'.

figure

[h{ii},f] = freqz(output(ii),1,4*8192,fs);

回答（1 个）

Aquatris 2024-2-3

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https://ww2.mathworks.cn/matlabcentral/answers/2077936-figure-output-blank-but-no-errors#answer_1402371

编辑：Aquatris 2024-2-3

在 MATLAB Online 中打开

When you call freqz with outputs, it does not draw a plot as written on the description of the function. So you need to do

[h,w] = freqz(b,a,'whole',2001);
plot(w/pi,20*log10(abs(h))) % specific call to plot

as shown in the documentation. If you open the freqz function code and check line 174 (Matlab 2023a) you will also see it only plots if there are no output arguments.

So I changes the line for output to this hoping it would fix it. What I want is for each output to be graphed. Since they are in cascade the output of one is the input to the next, so I am trying to plot all the outputs of every filter number. What I have below is not working though

output(ii,:) = gammatone(input, CenterFreqs(ii), fs);

plot(t,output(ii,:), 'LineWidth', 1.25)